Java : does regex pattern matcher have a size limit?

My pattern is OR-like : "word1|word2|word3" I have approxima开发者_运维知识库tely 800 words.

Can it be a problem ?

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You're only limited by memory and sanity. :)

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You might consider using the Aho–Corasick string searching algorithm. It would be much more efficient than a regex, since it's linear and optimized for your problem. It's also a way to pay respect to our fellows from 1975 !

In particular, there is this Java implementation.

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Why should it be? No, probably not.

A regexp with 800 words indicates a design problem somewhere, I would say. Why and what for do you need 800 words?